Device for use with helically-wound coils



Sept. 3, 1946. A. v. NICHOL DEVICE FOR USE WITH HELICALLY-WOUND COILS Filed July 15, 1943 Patented Sept. 3, 1946 DEVICE FOR USE WITH HELICALLY-WOUND COIL Arthur V. Nichol, Elkins Park, Pa., assignor .to

.Philco Radio and Television Corporation, Philadelphia, Pa., acorporation of Delaware Application July 15, 1943, Serial No. 494,856

4 Claims. 1

I his invention relatesto a novel device for use with helically-wound coils such as those commonly employed in radio apparatus and the like.

:One object of the invention is to provide a simple inexpensive device adapted for use with such a coil, especially in instances where tap connections are utilized in conjunction with the coil. The device serves to preserve the spacing between the coil turns and also serves to support the tap connections and to insulate them from one another.

Another object of the invention is to provide a device comprising an insulating member adapted to extend longitudinally of a coil and having spaced recesses to receive the successive turns of the coil, and also having apertures r passages extending from predetermined ones of said recesses to accommodate the tap connections.

A further object of the invention is to provide a device of this character in the form of a simple comb structure.

Another object of the invention is to provide a novel tap-securing device in conjunction with a helically-wound coil structure.

Other objects and features of the invention will appear hereinafter.

In the accompanying drawing:

Fig. 1 is an elevationa1 view of the device provided by the invention, with the central portion broken away to permit illustration on a desired scale;

Fig. 2 is a similar elevational view showing the device applied to a coil structure;

Fig. 3 is a detail sectional view taken along line 3--3 of Fig. 2; and

Fig. 4 is a sectional view taken along lin 4-4 of Fi 3.

Referring more particularly to the several views of the drawing, the device provided by this invention comprises a member I formed of insulating material, such as Bakelite, and constructed so as to cooperate with a helically-wound coil structure in the manner shown in Fig. 2, as will be presently described. To this end, the member I has end portions 2 adapted to be secured to the end portions of a coil support, and spaced teeth 3 and recesses 4 adapted to cooperate with the successive turns of the coil with which the device is associated. The teeth and recesses, which extend along one side of the member I, as illustrated, are so arranged and dimensioned that the teeth will fit between successive turns of the coil and the recesses will receive the coil turns.

In Fig. 2, there is shown a coil structure comprising a helically-wound coil 5 and a coil-supporting form or support 6. The support 6, which may be tubular or cylindrical in form, is preferably pre-grooved to receive and hold in predetermined alignment the several turns of the coil, a shown in Fig. 4. The comb structure I, provided by this invention, extends longitudinally of the coil with its teeth inserted between the coil turns in abutment with the coil-supporting form, and with its recesses accommodating the coil turns. In order to secure the device I to the coil structure, there may be provided apertures i in the end portions of the device to accommodate securing elements, such as shown at 8.

Device I is also provided with apertures or passages 9- extending from predetermined ones of the recesses to the opposite side of the device and adapted to accommodate tap connections, such as shown at IE! in Figs. 2 to 4. The end portion of each tap connection is bent as shown in Fig. 3 and extends transversely through va portion of recess 4 in engagement with the coil conductor 5. The depth of recess 4 is such that the bent end of the tap connection is firmly between the coil conductor and the end wall of the recess, as shown in Fig. 4. This arrangement provides a very secure mechanical attachment of the tap connection to the coil. Electrical connection between these elements is effected at the extreme end of the tap connection externally of device I by depositing small quantities of solder II on the said elements. Thus, the device not only serves to preserve the spacing between the coil turns but it also locates and securely supports the tap connections and insulates them from one another, and it permits th use of a very simple electrical joint between the tap connections and the coil.

In using the device I in conjunction with a particular coil, the tap connections are threaded through the apertures 9, prior to the assembly of the device on the coil, and the ends of the connections are then bent as shown and are positioned in recesses 4. The device is then assembled on the coil with the bent ends of the tap connections firmly held, as above described. Small quantities of solder are then applied to the exposed ends of the tap connections and the adjacent surfaces of the coil conductors.

The device of the invention is particularly useful in instances where the coil structure is subjected to vibration tending to dislodge the coil turns and the ta elements. For example, the invention is highly desirable in connection with 3 radio apparatus employed on moving vehicles and the like.

It will be understood, of course, that the width of the teeth and the width and depth of the recesses will vary according to the structural characteristics of the particular coil with which the device is to be used. With regard to the over-all dimensions of the device, the length will be determined by the axial length of the particular coil structure with which the device is to be used, while the other dimensions will be such as to permit the intended functioning of the device and at the same time give it suificient strength. In one physical embodiment, which may be taken as an example, the device had an over-all length of 5%; inches, a thickness of T g of an inch and a width of of an inch. The teeth were .035 inch wide, while the recesses were .056 inch wide and .1 inch deep.

Although a single device is shown in association with the coil structure in Fig. 2, a plurality of such devices may be used in conjunction with the same coil and may be spaced about the peripheral surface of the coil.

It will be understood, of course, that the invention is not limited to the particular structural embodiment disclosed but is capable of modification Within the scope of the appended claims.

I claim:

1. In combination with a helically-wound coil structure, an insulating member extending longitudinally of said coil structure externally of the same and secured thereto, said member having spaced recesses receiving the successive turns of the coil, said member also having at least one aperture or passage extending from a predetermined one of said recesses, a tap connection extending through said aperture and having its end bent and securely held in said one recess in firm engagement with the coil turn therein, the said end of said tap connection extending externally of said recess, and means forming an electrical joint between the extending end of said tap connection and the associated coil turn.

2. In combination with a helically-wound coil structure, an insulating member extending 1ongitudinally of said coil structure externally of the same and secured thereto, said member having spaced recesses receiving the successive turns of the coil, said member also having a plurality of apertures or passages extending from predetermined ones of said recesses, tap connections extending through said apertures and having their ends bent and securely held in said recesses in firm engagement with the coil turns, the said ends of the tap connections extending externally of said recesses, and means forming an electrical joint between the extending end of each tap connection and the associated coil turn.

3. In combination with a helically-wound coil structure, a tap-securing member attached to said structure externally of the same and having a recess receiving a coil turn, said member also having an aperture or passage extending from said recess, a tap connection extending through said aperture and having its end bent and securely held in said recess in firm engagement with said coil turn, the said end of said connection extending externally of said recess, and means forming an electrical joint between the extending end of said tap connection and the associated coil turn.

4. In combination with a helically-wound coil structure, an insulating member extending longitudinally of said coil structure externally of the same and secured thereto, said member having spaced recesses receiving the successive turns of the coil, said member also having at least one aperture or passage extending from a predetermined one of said recesses, and a tap connection extending through said aperture and having its end bent and securely held in said one recess in firm engagement with the coil turn therein, the said end of said tap connection being electrically joined to the associated coil turn.

ARTHUR V. NICHOL. 

